To a solution weighing 200 g by mass fraction of sodium nitrate 18% was added water weighing 250 g. determine the mass fraction of salt in the resulting solution.
Find the mass of sodium nitrate in the original solution
M1 = 200 * 0.18 = 36 grams
If you add 250 grams of water to the original solution, its mass will increase and will be M2 = 200 + 250 = 450 grams.
The mass fraction of salt in the resulting solution will be 36/450 = 0.08 = 8.0%
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